code: def test_ddm_ineg():
      a = [[1, 2], [3, 4]]
      ddm_ineg(a)
      assert a == [[-1, -2], [-3, -4]]
  
file_path: sympy/sympy/polys/matrices/tests/test_dense.py
imports: from sympy.testing.pytest import raises
  from sympy.polys import ZZ, QQ
  from sympy.polys.matrices.ddm import DDM
  from sympy.polys.matrices.dense import ddm_transpose, ddm_iadd, ddm_isub, ddm_ineg, ddm_imatmul, ddm_imul, ddm_irref, ddm_idet, ddm_iinv, ddm_ilu, ddm_ilu_split, ddm_ilu_solve, ddm_berk
  from sympy.polys.matrices.exceptions import DMDomainError, DMNonInvertibleMatrixError, DMNonSquareMatrixError, DMShapeError
label_desc: Use image node_id 4 for calling a global function with example usage: test_ddm_ineg() without return types